mirror of
https://github.com/chaijs/chai
synced 2024-11-15 08:17:14 +00:00
882 lines
No EOL
17 KiB
JavaScript
882 lines
No EOL
17 KiB
JavaScript
/*!
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* chai
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* Copyright(c) 2011 Jake Luer <jake@alogicalparadox.com>
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* MIT Licensed
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*
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* Primarily a refactor of: should.js
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* https://github.com/visionmedia/should.js
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* Copyright(c) 2011 TJ Holowaychuk <tj@vision-media.ca>
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* MIT Licensed
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*/
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/**
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* ### BDD Style Introduction
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*
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* The BDD style is exposed through `expect` or `should` interfaces. In both
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* scenarios, you chain together natural language assertions.
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*
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* // expect
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* var expect = require('chai').expect;
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* expect(foo).to.equal('bar');
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*
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* // should
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* var should = require('chai').should();
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* foo.should.equal('bar');
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*
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* #### Differences
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*
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* The `expect` interface provides a function as a starting point for chaining
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* your language assertions. It works on both node.js and in the browser.
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*
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* The `should` interface extends `Object.prototype` to provide a single getter as
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* the starting point for your language assertions. Most browser don't like
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* extensions to `Object.prototype` so it is not recommended for browser use.
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*/
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/*!
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* Module dependencies.
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*/
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var AssertionError = require('./error')
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, eql = require('./utils/eql')
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, inspect = require('./utils/inspect')
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, statusCodes = require('./utils/constants').STATUS_CODES;
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/*!
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* Module export.
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*/
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module.exports = Assertion;
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/*!
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* # Assertion Constructor
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*
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* Creates object for chaining.
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*
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* @api private
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*/
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function Assertion (obj, msg, stack) {
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this.ssfi = stack || arguments.callee;
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this.obj = obj;
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this.msg = msg;
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}
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/*!
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* # .assert(expression, message, negateMessage)
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*
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* Executes an expression and check expectations. Throws AssertionError for reporting if test doesn't pass.
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*
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* @name assert
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* @param {Philosophical} expression to be tested
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* @param {String} message to display if fails
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* @param {String} negatedMessage to display if negated expression fails
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* @api privage
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*/
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Assertion.prototype.assert = function (expr, msg, negateMsg) {
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var msg = (this.negate ? negateMsg : msg)
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, ok = this.negate ? !expr : expr;
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if (!ok) {
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throw new AssertionError({
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operator: this.msg,
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message: msg,
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stackStartFunction: this.ssfi
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});
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}
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};
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/*!
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* # inspect
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*
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* Returns the current object stringified.
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*
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* @name inspect
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* @api private
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*/
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Object.defineProperty(Assertion.prototype, 'inspect',
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{ get: function () {
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return inspect(this.obj);
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}
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});
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/**
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* # to
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*
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* Language chain.
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*
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* @name to
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* @api public
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*/
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Object.defineProperty(Assertion.prototype, 'to',
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{ get: function () {
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return this;
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}
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});
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/**
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* # be
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*
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* Language chain.
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*
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* @name be
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* @api public
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*/
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Object.defineProperty(Assertion.prototype, 'be',
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{ get: function () {
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return this;
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}
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});
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/**
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* # an
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*
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* Language chain.
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*
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* @name an
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* @api public
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*/
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Object.defineProperty(Assertion.prototype, 'an',
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{ get: function () {
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return this;
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}
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});
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/**
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* # is
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*
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* Language chain.
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*
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* @name is
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* @api public
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*/
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Object.defineProperty(Assertion.prototype, 'is',
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{ get: function () {
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return this;
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}
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});
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/**
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* # and
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*
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* Language chain.
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*
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* @name and
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* @api public
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*/
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Object.defineProperty(Assertion.prototype, 'and',
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{ get: function () {
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return this;
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}
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});
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/**
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* # have
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*
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* Language chain.
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*
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* @name have
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* @api public
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*/
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Object.defineProperty(Assertion.prototype, 'have',
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{ get: function () {
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return this;
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}
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});
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/**
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* # with
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*
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* Language chain.
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*
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* @name with
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* @api public
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*/
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Object.defineProperty(Assertion.prototype, 'with',
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{ get: function () {
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return this;
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}
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});
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/**
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* # .not
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*
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* Negates any of assertions following in the chain.
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*
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* @name not
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* @api public
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*/
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Object.defineProperty(Assertion.prototype, 'not',
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{ get: function () {
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this.negate = true;
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return this;
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}
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});
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/**
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* # .ok
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*
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* Assert object truthiness.
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*
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* expect('everthing').to.be.ok;
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* expect(false).to.not.be.ok;
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* expect(undefined).to.not.be.ok;
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* expect(null).to.not.be.ok;
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*
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* @name ok
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* @api public
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*/
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Object.defineProperty(Assertion.prototype, 'ok',
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{ get: function () {
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this.assert(
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this.obj
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, 'expected ' + this.inspect + ' to be truthy'
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, 'expected ' + this.inspect + ' to be falsey');
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return this;
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}
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});
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/**
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* # .true
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*
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* Assert object is true
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*
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* @name true
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* @api public
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*/
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Object.defineProperty(Assertion.prototype, 'true',
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{ get: function () {
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this.assert(
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true === this.obj
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, 'expected ' + this.inspect + ' to be true'
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, 'expected ' + this.inspect + ' to be false');
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return this;
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}
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});
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/**
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* # .false
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*
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* Assert object is false
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*
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* @name false
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* @api public
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*/
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Object.defineProperty(Assertion.prototype, 'false',
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{ get: function () {
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this.assert(
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false === this.obj
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, 'expected ' + this.inspect + ' to be false'
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, 'expected ' + this.inspect + ' to be true');
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return this;
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}
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});
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/**
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* # .exist
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*
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* Assert object exists (null).
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*
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* var foo = 'hi'
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* , bar;
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* expect(foo).to.exist;
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* expect(bar).to.not.exist;
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*
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* @name exist
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* @api public
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*/
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Object.defineProperty(Assertion.prototype, 'exist',
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{ get: function () {
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this.assert(
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null != this.obj
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, 'expected ' + this.inspect + ' to exist'
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, 'expected ' + this.inspect + ' to not exist');
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return this;
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}
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});
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/**
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* # .empty
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*
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* Assert object's length to be 0.
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*
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* expect([]).to.be.empty;
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*
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* @name empty
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* @api public
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*/
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Object.defineProperty(Assertion.prototype, 'empty',
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{ get: function () {
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new Assertion(this.obj).to.have.property('length');
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this.assert(
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0 === this.obj.length
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, 'expected ' + this.inspect + ' to be empty'
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, 'expected ' + this.inspect + ' not to be empty');
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return this;
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}
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});
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/**
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* # .arguments
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*
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* Assert object is an instanceof arguments.
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*
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* function test () {
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* expect(arguments).to.be.arguments;
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* }
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*
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* @name arguments
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* @api public
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*/
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Object.defineProperty(Assertion.prototype, 'arguments',
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{ get: function () {
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this.assert(
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'[object Arguments]' == Object.prototype.toString.call(this.obj)
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, 'expected ' + this.inspect + ' to be arguments'
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, 'expected ' + this.inspect + ' to not be arguments');
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return this;
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}
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});
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/**
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* # .equal(value)
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*
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* Assert strict equality.
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*
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* expect('hello').to.equal('hello');
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*
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* @name equal
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* @param {*} value
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* @api public
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*/
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Assertion.prototype.equal = function (val) {
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this.assert(
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val === this.obj
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, 'expected ' + this.inspect + ' to equal ' + inspect(val)
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, 'expected ' + this.inspect + ' to not equal ' + inspect(val));
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return this;
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};
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/**
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* # .eql(value)
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*
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* Assert deep equality.
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*
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* expect({ foo: 'bar' }).to.eql({ foo: 'bar' });
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*
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* @name eql
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* @param {*} value
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* @api public
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*/
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Assertion.prototype.eql = function (obj) {
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this.assert(
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eql(obj, this.obj)
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, 'expected ' + this.inspect + ' to equal ' + inspect(obj)
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, 'expected ' + this.inspect + ' to not equal ' + inspect(obj));
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return this;
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};
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/**
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* # .above(value)
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*
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* Assert greater than `value`.
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*
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* expect(10).to.be.above(5);
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*
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* @name above
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* @param {Number} value
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* @api public
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*/
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Assertion.prototype.above = function (val) {
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this.assert(
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this.obj > val
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, 'expected ' + this.inspect + ' to be above ' + val
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, 'expected ' + this.inspect + ' to be below ' + val);
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return this;
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};
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/**
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* # .below(value)
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*
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* Assert less than `value`.
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*
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* expect(5).to.be.below(10);
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*
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* @name below
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* @param {Number} value
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* @api public
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*/
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Assertion.prototype.below = function (val) {
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this.assert(
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this.obj < val
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, 'expected ' + this.inspect + ' to be below ' + val
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, 'expected ' + this.inspect + ' to be above ' + val);
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return this;
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};
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/**
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* # .within(start, finish)
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*
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* Assert that a number is within a range.
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*
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* expect(7).to.be.within(5,10);
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*
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* @name within
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* @param {Number} start lowerbound inclusive
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* @param {Number} finish upperbound inclusive
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* @api public
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*/
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Assertion.prototype.within = function (start, finish) {
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var range = start + '..' + finish;
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this.assert(
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this.obj >= start && this.obj <= finish
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, 'expected ' + this.inspect + ' to be within ' + range
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, 'expected ' + this.inspect + ' to not be within ' + range);
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return this;
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};
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/**
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* # .a(type)
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*
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* Assert typeof.
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*
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* expect('test').to.be.a('string');
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*
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* @name a
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* @param {String} type
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* @api public
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*/
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Assertion.prototype.a = function (type) {
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this.assert(
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type == typeof this.obj
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, 'expected ' + this.inspect + ' to be a ' + type
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, 'expected ' + this.inspect + ' not to be a ' + type);
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return this;
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};
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/**
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* # .instanceof(constructor)
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*
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* Assert instanceof.
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*
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* var Tea = function (name) { this.name = name; }
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* , Chai = new Tea('chai');
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*
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* expect(Chai).to.be.an.instanceOf(Tea);
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*
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* @name instanceof
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* @param {Constructor}
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* @api public
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*/
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Assertion.prototype.instanceof = function (constructor) {
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var name = constructor.name;
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this.assert(
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this.obj instanceof constructor
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, 'expected ' + this.inspect + ' to be an instance of ' + name
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, 'expected ' + this.inspect + ' to not be an instance of ' + name);
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return this;
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};
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/**
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* # .property(name, [value])
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*
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* Assert that property of `name` exists, optionally with `value`.
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*
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* var obj = { foo: 'bar' }
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* expect(obj).to.have.property('foo');
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* expect(obj).to.have.property('foo', 'bar');
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* expect(obj).to.have.property('foo').to.be.a('string');
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*
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* @name property
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* @param {String} name
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* @param {*} value (optional)
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* @returns value of property for chaining
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* @api public
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*/
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Assertion.prototype.property = function (name, val) {
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if (this.negate && undefined !== val) {
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if (undefined === this.obj[name]) {
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throw new Error(this.inspect + ' has no property ' + inspect(name));
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}
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} else {
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this.assert(
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undefined !== this.obj[name]
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, 'expected ' + this.inspect + ' to have a property ' + inspect(name)
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, 'expected ' + this.inspect + ' to not have property ' + inspect(name));
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}
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if (undefined !== val) {
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this.assert(
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val === this.obj[name]
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, 'expected ' + this.inspect + ' to have a property ' + inspect(name) + ' of ' +
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inspect(val) + ', but got ' + inspect(this.obj[name])
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, 'expected ' + this.inspect + ' to not have a property ' + inspect(name) + ' of ' + inspect(val));
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}
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this.obj = this.obj[name];
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return this;
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};
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/**
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* # .ownProperty(name)
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*
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* Assert that has own property by `name`.
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*
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* expect('test').to.have.ownProperty('length');
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*
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* @name ownProperty
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* @alias haveOwnProperty
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* @param {String} name
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* @api public
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*/
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Assertion.prototype.ownProperty = function (name) {
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this.assert(
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this.obj.hasOwnProperty(name)
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, 'expected ' + this.inspect + ' to have own property ' + inspect(name)
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, 'expected ' + this.inspect + ' to not have own property ' + inspect(name));
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return this;
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};
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/**
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* # .length(val)
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*
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* Assert that object has expected length.
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*
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* expect([1,2,3]).to.have.length(3);
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* expect('foobar').to.have.length(6);
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*
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* @name length
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* @alias lengthOf
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* @param {Number} length
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* @api public
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*/
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Assertion.prototype.length = function (n) {
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new Assertion(this.obj).to.have.property('length');
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var len = this.obj.length;
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this.assert(
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len == n
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, 'expected ' + this.inspect + ' to have a length of ' + n + ' but got ' + len
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, 'expected ' + this.inspect + ' to not have a length of ' + len);
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return this;
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};
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/**
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* # .match(regexp)
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*
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* Assert that matches regular expression.
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*
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* expect('foobar').to.match(/^foo/);
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*
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* @name match
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* @param {RegExp} RegularExpression
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* @api public
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*/
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Assertion.prototype.match = function (re) {
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this.assert(
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re.exec(this.obj)
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, 'expected ' + this.inspect + ' to match ' + re
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, 'expected ' + this.inspect + ' not to match ' + re);
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|
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return this;
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};
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|
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/**
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* # .include(obj)
|
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*
|
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* Assert the inclusion of an object in an Array or substring in string.
|
|
*
|
|
* expect([1,2,3]).to.contain(2);
|
|
*
|
|
* @name include
|
|
* @param {Object|String|Number} obj
|
|
* @api public
|
|
*/
|
|
|
|
Assertion.prototype.include = function (obj) {
|
|
this.assert(
|
|
~this.obj.indexOf(obj)
|
|
, 'expected ' + this.inspect + ' to include ' + inspect(obj)
|
|
, 'expected ' + this.inspect + ' to not include ' + inspect(obj));
|
|
|
|
return this;
|
|
};
|
|
|
|
/**
|
|
* # .string(string)
|
|
*
|
|
* Assert inclusion of string in string.
|
|
*
|
|
* expect('foobar').to.include.string('bar');
|
|
*
|
|
* @name string
|
|
* @param {String} string
|
|
* @api public
|
|
*/
|
|
|
|
Assertion.prototype.string = function (str) {
|
|
new Assertion(this.obj).is.a('string');
|
|
|
|
this.assert(
|
|
~this.obj.indexOf(str)
|
|
, 'expected ' + this.inspect + ' to contain ' + inspect(str)
|
|
, 'expected ' + this.inspect + ' to not contain ' + inspect(str));
|
|
|
|
return this;
|
|
};
|
|
|
|
|
|
|
|
/**
|
|
* # contain
|
|
*
|
|
* Toggles the `contain` flag for the `keys` assertion.
|
|
*
|
|
* @name contain
|
|
* @api public
|
|
*/
|
|
|
|
Object.defineProperty(Assertion.prototype, 'contain',
|
|
{ get: function () {
|
|
this.contains = true;
|
|
return this;
|
|
}
|
|
});
|
|
|
|
/**
|
|
* # .keys(key1, [key2], [...])
|
|
*
|
|
* Assert exact keys or the inclusing of keys using the `contain` modifier.
|
|
*
|
|
* expect({ foo: 1, bar: 2 }).to.have.keys(['foo', 'bar']);
|
|
* expect({ foo: 1, bar: 2, baz: 3 }).to.contain.keys('foo', 'bar');
|
|
*
|
|
* @name keys
|
|
* @alias key
|
|
* @param {String|Array} Keys
|
|
* @api public
|
|
*/
|
|
|
|
Assertion.prototype.keys = function(keys) {
|
|
var str
|
|
, ok = true;
|
|
|
|
keys = keys instanceof Array
|
|
? keys
|
|
: Array.prototype.slice.call(arguments);
|
|
|
|
if (!keys.length) throw new Error('keys required');
|
|
|
|
var actual = Object.keys(this.obj)
|
|
, len = keys.length;
|
|
|
|
// Inclusion
|
|
ok = keys.every(function(key){
|
|
return ~actual.indexOf(key);
|
|
});
|
|
|
|
// Strict
|
|
if (!this.negate && !this.contains) {
|
|
ok = ok && keys.length == actual.length;
|
|
}
|
|
|
|
// Key string
|
|
if (len > 1) {
|
|
keys = keys.map(function(key){
|
|
return inspect(key);
|
|
});
|
|
var last = keys.pop();
|
|
str = keys.join(', ') + ', and ' + last;
|
|
} else {
|
|
str = inspect(keys[0]);
|
|
}
|
|
|
|
// Form
|
|
str = (len > 1 ? 'keys ' : 'key ') + str;
|
|
|
|
// Have / include
|
|
str = (this.contains ? 'contain ' : 'have ') + str;
|
|
|
|
// Assertion
|
|
this.assert(
|
|
ok
|
|
, 'expected ' + this.inspect + ' to ' + str
|
|
, 'expected ' + this.inspect + ' to not ' + str);
|
|
|
|
return this;
|
|
}
|
|
|
|
/**
|
|
* # .throw(constructor)
|
|
*
|
|
* Assert that a function will throw a specific type of error.
|
|
*
|
|
* var fn = function () { throw new ReferenceError(''); }
|
|
* expect(fn).to.throw(ReferenceError);
|
|
*
|
|
* @name throw
|
|
* @alias throws
|
|
* @param {ErrorConstructor} constructor
|
|
* @see https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Error#Error_types
|
|
* @api public
|
|
*/
|
|
|
|
Assertion.prototype.throw = function (constructor) {
|
|
new Assertion(this.obj).is.a('function');
|
|
|
|
var thrown = false;
|
|
|
|
try {
|
|
this.obj();
|
|
} catch (err) {
|
|
if (constructor) {
|
|
this.assert(
|
|
err instanceof constructor && err.name == constructor.name
|
|
, 'expected ' + this.inspect + ' to throw ' + constructor.name + ' but a ' + err.name + ' was thrown'
|
|
, 'expected ' + this.inspect + ' to not throw ' + constructor.name );
|
|
|
|
return this;
|
|
} else {
|
|
thrown = true;
|
|
}
|
|
}
|
|
|
|
var name = (constructor ? constructor.name : 'an error');
|
|
|
|
this.assert(
|
|
thrown === true
|
|
, 'expected ' + this.inspect + ' to throw ' + name
|
|
, 'expected ' + this.inspect + ' to not throw ' + name);
|
|
|
|
return this;
|
|
};
|
|
|
|
/**
|
|
* # .header(code)
|
|
*
|
|
* Assert `header` field has expected `value`.
|
|
*
|
|
* @name header
|
|
* @param {String} field
|
|
* @param {String} value
|
|
* @api public
|
|
*/
|
|
|
|
Assertion.prototype.header = function (field, val) {
|
|
new Assertion(this.obj)
|
|
.to.have.property('headers').and
|
|
.to.have.property(field.toLowerCase(), val);
|
|
|
|
return this;
|
|
}
|
|
|
|
/**
|
|
* # .status(code)
|
|
*
|
|
* Assert `statusCode` of `code'.
|
|
*
|
|
* @name status
|
|
* @param {Number} code
|
|
* @api public
|
|
*/
|
|
|
|
Assertion.prototype.status = function (code) {
|
|
new Assertion(this.obj).to.have.property('statusCode');
|
|
|
|
var status = this.obj.statusCode;
|
|
|
|
this.assert(
|
|
code == status
|
|
, 'expected response code of ' + code + ' ' + inspect(statusCodes[code])
|
|
+ ', but got ' + status + ' ' + inspect(statusCodes[status])
|
|
, 'expected to not respond with ' + code + ' ' + inspect(statusCodes[code]));
|
|
}
|
|
|
|
/**
|
|
* # json
|
|
*
|
|
* Assert that this response has content-type: application/json.
|
|
*
|
|
* @name json
|
|
* @api public
|
|
*/
|
|
|
|
Object.defineProperty(Assertion.prototype, 'json',
|
|
{ get: function () {
|
|
new Assertion(this.obj).to.have.header('content-type', 'application/json; charset=utf-8');
|
|
return this;
|
|
}
|
|
});
|
|
|
|
/**
|
|
* # html
|
|
*
|
|
* Assert that this response has content-type: text/html.
|
|
*
|
|
* @name html
|
|
* @api public
|
|
*/
|
|
|
|
Object.defineProperty(Assertion.prototype, 'html',
|
|
{ get: function () {
|
|
new Assertion(this.obj).to.have.header('content-type', 'text/html; charset=utf-8');
|
|
return this;
|
|
}
|
|
});
|
|
|
|
|
|
/*!
|
|
* Aliases.
|
|
*/
|
|
|
|
(function alias(name, as){
|
|
Assertion.prototype[as] = Assertion.prototype[name];
|
|
return alias;
|
|
})
|
|
('length', 'lengthOf')
|
|
('keys', 'key')
|
|
('ownProperty', 'haveOwnProperty')
|
|
('above', 'greaterThan')
|
|
('below', 'lessThan')
|
|
('throw', 'throws'); |